Power factor corrected 3-phase Ac-dc power converter using natural modulation

Inactive Publication Date: 2012-10-30
HERBERT EDWARD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0024]This invention also teaches that when a 3-phase pfc 100% duty-ratio buck converter and a 3-phase pfc 0% duty-ratio boost converter are used in a series-parallel or a parallel-series arrangement, the series connections whether on the input or the output constrain the currents of both sections, giving effective control of the current balance to the 3-phase pfc 100% duty-ratio buck converter. Similarly, the parallel connections, whether on the input or the output constrain the voltages of both sections, giving eff

Problems solved by technology

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Method used

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  • Power factor corrected 3-phase Ac-dc power converter using natural modulation
  • Power factor corrected 3-phase Ac-dc power converter using natural modulation
  • Power factor corrected 3-phase Ac-dc power converter using natural modulation

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Embodiment Construction

[0049]With the exception of FIG. 21, all of the graphs in the figures are from SPICE simulation using the SPICE oscillograph function. The graphs were copied and pasted into a CAD program where they were edited for appearance, but none of the waveforms were altered.

[0050]The pfc 3-phase ac-dc power converter 1 of FIG. 1 uses ac switches 4 through 9 to switch the ac input voltages A, B and C to an inductor 10. A catch rectifier 1 conducts the current of the inductor 10 if the ac switches 4 through 9 are all off, as they may be part of the time during an over-voltage condition. An ac switch is defined as a switch that blocks voltage of either polarity when it is turned off. Back to back MOSFETs are commonly used as ac switches, as would be known by one skilled in the art of power converters. A variable dc-dc transformer 3 and an output capacitor 12 complete the circuit. The connections to the circuits within the variable dc-dc transformer 3 are not shown, as they are not a point of no...

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Abstract

A 3-phase pfc 100% duty-ratio buck converter and a 3-phase 0% duty-ratio boost converter can be used in parallel with their outputs in series to greatly reduce the ripple voltage in the output. They can also be used in series with their outputs in parallel to greatly reduce the ripple current in the output. A 3-phase 0% duty-ratio boost converter having isolated primary circuits for each phase is used when the inputs are in series.

Description

CROSS REFERENCE TO RELATED PATENT APPLICATIONS[0001]This application is a continuation in part of a provisional U.S. patent application Ser. No. 61 / 115,094 filed Nov. 16, 2008 and entitled Power Factor Corrected 3-phase Ac-dc Power Converter using “Natural Modulation”. This application is also a continuation in part of a provisional U.S. patent application Ser. No. 61 / 148,031 filed Jan. 28, 2009 and entitled Natural Modulation. Priority is claimed to the filing dates of these provisional US patent applications and they are incorporated herein by reference.[0002]This patent application relates to U.S. patent application Ser. No. 11 / 943,864, filed Nov. 21, 2007, and entitled 100% Duty-Cycle Buck-Derived and 0% Duty-Cycle Boost-Derived Power Factor Corrected (PFC) 3-Phase Ac-Dc Power Converters. This patent application issued as U.S. Pat. No. 7,633,782 on Dec. 15, 2009. This patent application is incorporated herein by reference.[0003]This patent application relates to U.S. patent appl...

Claims

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Application Information

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IPC IPC(8): H02M7/00
CPCH02M1/4216H02M3/33592H02M3/3374Y02B70/126Y02B70/1475Y02B70/10Y02P80/10
Inventor HERBERT, EDWARD
Owner HERBERT EDWARD
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